Radial drill.



W. T. SEARS.

' RADIAL DRILL.

' APPLICATION FILED 0011219 12. 1,071,590. Patented Aug. 26, 1913.

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RADIAL DRILL. \PILIOATION FILED 00112, 1912 Patented Aug. 26, 1913.

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WILLARD T. SEARS, OF HARTFORD. CONNECTICUT, ASSIGNOR TO PRATT WHITNEY COE IPANY, OF HARTFORD, GONNEGI'ICUT, A CORPORATIGN OF NEW JERSEY.

RADIAL DRILL.

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Specification of Letters Patent.

Patented Aug; 26,1913.

Application filed October 12, 1812. Serial No; 725,416.

Hartford, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements n Radial YDrills', of ivhich the following is a specification I I This invention relates to' radial-drills, one

, of theprimary purposes of the invention being to providea machine of this character which is compact and by which the arm that carries the drilhspindlehead will be effectually and substantially sustained.

The invention comprises other features of novelty and advantage whiclrvvith the foregoing will be stated at length inthe following description wherein I will set forth in detail one of the several convenient forms of embodiment of the invention to enablethoseskilled in the art to-practice the'same. From this it will be clear that I do not limit inyselfto such showing; I may depart therefrom in several respects Within thescope of the invention defined by the claims following said description.

Referring to said drawings: Figure 1 is a front elevation of a radial drill involving my invention. Fig. 2 is a horizontal section on the line 22 of Fig. 1; Fig. 3 is a detail view of a portion of the column with a part. thereof in section. Fig. l isa horizontal section on the line 4-4 of Fig. 3.

Like characters refer to like parts throughout the several Figuresof the drawings.

The machine shovvuin the drawings in-v volves in its makeup a base or bed as 2 and, a column 3 rising from said base. This column or upright 3 as Will hereinafter-more particularly appear is of novel construction, having two sides through Which a powertransmitting shaft extends. As a matter of extra strength the column is made of inverted U-form, although in all cases it might not be necessary to make it of this shape, the essential feature being to provide a column having two side sections. or branches which need not necessarily be connected at the top. 1 I

The drill-spindle is denoted by i, and is shown vertically'disposed, being carried by suitable bearingsin' or on the head. The head 5 is provided with the usual accessories'for longitudinally adjusting the spindle and for also adjusting the head along" the horizontall disposed supporting arm (3 therefor. These acccsories are common and \vell-kitbwn in the art and therefore require no desgriptionf The arm 6 as illustrated consists of two parts 7 and 8, the main part Tdirectly carrying the drill-spindle-head and the auxiliary or supplemental part 8 being vertically adjustable against the branches'of the col,-

umn 3 which for such purpose have substantially angular parallel \vavs Q for practically the complete lenf'l. th reof and which fit similarly shaped grooves or-channels in the arm part 8. it will: therefore, be clear that the arn G as a-'\vhole is adjustable longitudinally of the column 3 The section 7 of the arm fits for turiiing movement against the section 8, the latter having on its outer face the T-shaped simulatgrooves 10 to receive the headset the bolts 11 extending through the flange 12 at the inner end of the part 7.. it is not uncommon in radial drills to provide a spindle-head supporting arm adjustable about its longitudinal axis and, therefore, this particularfea ture requires no extended statement any more than to indicate that when the part 7 has been rotatably adjusted, it will be maintained in-its adjusted relation by setting up the nuts of the bolts 11. I provide Worm gearing as also usual to turnably adjust the section 7 of the supporting arm. 2

As a means for rotating the drill spindle 4f the horizontal shaft 13 can be advantageously utilized, this shaft," extending through the space or interval between the sides or branches of the column 3, which provides a very simple and compact construction. \Vithin the head, the said shaft is connected through the intervention of suitable gearing such as shown and now to be described with the drill spindle l.-

Keyed or otherwise suitably fastened to the shaft 13 is the bevel pinion 25 in mesh with while the supporting arm 6 is at the other,

so that the motor mechanism and the arm mechanism practically counterbalance each other, the motor or its bracket having a bearing against the rear of the column 3, the branches thereof for such purpose being shown provided with angular ways or ribs 16 duplicates of the ways 9 already described, which enter similarly shaped grooves or channels in the forward side of the motor-carrying bracket or equivalent part 15. 1

In the construction shown the supporting arm 6 and the motor carrying bracket 15 are rigidly tied together in some suitable way such as by the connecting piece 17, so that they in effect can be vertically adjusted as one. The connecting piece 17 is illustrated integral with the-part 8 and connected by bolts 18 with the motor-carrying bracket 15, extending through the space between the branches of the column 3, and channeled for the passage oft-he shaft 13 which isdirectly operable by the motor 1%, the portion 7 of said supporting arm turning about the axis of rotation of the motor-driven shaft 13.

What I claim is:

l. A radial drill comprising a column having side branches, a drill head supporting a'rm having an adjustable bearing against one side of the column, an electric motor and a carrying bracket therefor, said bracket having an adjustable bearing against the opposite side or said column, a drill spindle on said head, operative connections between said motor and spindle, and means extending through the space between said side branches, for tying the bracket and head together.

2. A radial drill con'iprising a column having side branches, a drill-hczul-sup orting arm, a drill-head and its spindle on said arm, an electric motor and its carrying bracket, means extending through the space between the sections of said column, for tying said bracket and arm together, both said bracket and arm being adjustable along said column, and a driving connection between said motor and spindle.

3. A radial-drill comprising a column having side branches, a drill-head-supporting arm, said side branches having ways to receive said arm longitudinally of the column, and an electric-motor and its carrying bracket, said branches having ways to receive said bracket for adjustment longitudinally of the column, said motor having a shaft for -rotating the spindle, extending forwardly therefrom through the space between said side branches.

4. A radial-drill comprising a column having side branches, a drill-head-supporting arm, said side branches having ways to support said arm for adjustment longitudinally of the column, an electric motor and a carrying bracket therefor, said bra clztet being tied to said arm for movement therewith, the column having ways to receive said bracket for adjustment longitudinally of the column. the motor having a shaft extending forward therefrom and between the side branches of the column, for operating said spindle and said tie being in addition to said. shaft.

In testimony whereof I affix my signature in presence of two witnesses.

lVlLLAlEtD T. SEARS lVitnesses \V. M. Sronns, S. W. RiLnoUnNn. 

